题目内容
8. Although the authorities have been informed on several occasions, no action has been taken to prevent the river . (pollute)
尽管当局已多次收到消息,但他们仍没有采取行动来阻止该河受到污染。
8. ( from ) being polluted考查prevent后动词的用法」prevent sb./ sth. (from ) doing sth.
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